83 



Description of Entomostraca from the Mountain Limestone 

 of Berwickshire and Northumberland. By Professor T. 

 Rupert Jones, F.G.S., &c. With notes on the Strata in 

 which they occur. By George Tate, F.G.S. , &c. 



In the course of an exploration of the Berwickshire coast in 

 1854, I found some peculiar fossils, resembling somewhat 

 compressed Sa^iguinolites, and occurring as rusty film on a 

 black carbonaceous shale. Being, however, persuaded that 

 they were not mollusks, and that moreover they were new, I 

 submitted them sometime afterwards to Professor Jones and 

 Dr Baird ; and we arrived at the conclusion that they were 

 Entomostraca of the genus Estheria. As Professor Jones was 

 directing special attention to this group of organisms, I 

 placed my specimens of mountain limestone Entomostraca in 

 his hands for examination and description. 



In a monograph on Fossil Estherit^ published by the 

 Palseographical Society, he has given a description of this 

 fossil ; and with his permission it is here reprinted, as a con- 

 tribution to the Natural History of the Borders ; along with 

 the description of two other new forms of Entomostraca. 

 Professor Jones finds that Goldfuss and De Koninck have 

 figured and described a similar fossil ; the former under the 

 name of Sanguinolaria striata, and the latter of Cardio- 

 morpha striata. The following are Professor Jones' de- 

 scription of the genus, the species, and the Berwickshire 

 variety : — 



Genus ESTHERIA. . 



'' Estheria is a Crustacean Entomostracous Phyllopodous 

 animal, with numerous branchial feet ; four pairs of antennse 

 (the two upper pairs used for locomotion) ; caudal segment 

 ending in four hooked lamellae ; eyes two, closely approxi- 

 mate ; carapace bivalve, enclosing the animal excepting part of 

 its head, thin, horny, concentrically ridged and reticulated, 

 pitted, or striated between the ridges. 



" Estheria is found in fresh and brackish waters. 



" In the fossil state the characters of the carapace alone 

 are recognisable. 



" Estheria striata, Munster, sp. 



Sanguinolaria striata, Munster and Goldfuss. 1826, Petref. Ger- 

 manise, XL, p. 280, pi. 159, fig. 19. 



Cardiomokpha striata, De Koninck. 1842, Anim. Fossil. Ter. 

 Carbonif. Belgique, p. 105, pi. H. fig. 9, a, h, c. 



